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(No Model.)

J. H. BLESSING.

STEAM PUMP.

No. 283,064. Patented Aug. 14, 1883.

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PATENT @FFICE.

JAMES H. BLESSING, OFALBANY, NEW YORK.

SPECIFICATION formingpart. of Letters Patent No.283,064,dated"August 14,1883.

Application filed March 11, 1882. (No model.)

To aZZ whom it may concern:

Be it known that I, JAMES H. BLESSING,

of the city of Albany and State of New York,

have invented a new and useful Improvement 5 in Steam-Pumps, of whichthefollowing is a full, true, and exact description, reference be ing hadtothe accompanying drawings.

My improvement relates to an apparatus for I avoiding or diminishing thejar orconcussion" 1o occasioned by the operation of steam-pumps; and itconsists in an apparatus by means of which the Inovementof the Waterisgradually started and stopped at each end of the-stroke. My inventionwill be fully understood from I 5 the accompanying drawings,illustrating in sectional elevation my improved pump, and in which Arepresents a steam-cylinder; B, a pumpcylinder, which may be providedwith any 20 proper valves.

0 represents themain steam-piston, and L .the pump-piston. Interior to'the steam and pump pistons G L are the secondary steam and pump pistonsE M. Theratio of the secondary 2 5 steam-piston E to the water-piston Mis greater than the ratio of the main steam-piston G to the water-pistonL. The main pistons are con nected by piston-rod D, andthe secondarypistons by secondary piston-rod E, which should i go make areasonably-tight joint within the exterior piston-rod, and, if desired,might be packed.

/ The operation of my apparatus can now be understood. Supposing themain and aux- 5 iliary pistons to be at the right of their re- 9spective cylinders, and steam to be admitted through the port N upon theright, this steam will tend to move both the piston E and the piston Otothe left; but therebeing less re- 0 sistance per square inch to themovement of the piston E, that pistonwill move first, and

will therefore startthe water in the pumpchamber by forcing out thewater which is contained in the cylinder within the water-piston 5 L. Assoon as the piston E has brought up against the main piston G the twopistons will move together to the leftuntil the tappet R of piston-rod Fstrikes the buffer H, when the piston E will cease to move, and the mainpiston C will complete its stroke. By thus stopping the piston E theflow of water is de creased, for two reasonsin the first place be causeonly the area of the piston L is then acting to force the water out, andin the second place because the piston M, retiring into its cylinder,affords an additional space for the water in the left of thepump-chamber.

The piston 0 having completed its stroke to the left, steam is admittedthrough the port P This steam enters the interior steam-cylinder throughthe ports J, and the piston E is consequently the first to move to theright, thereby starting the water in the right of the pump-chamber,which water is in communication with the interior pump-cylinder by theports K. The stroke is continued to the right 7 until the tappet Sstrikes against the buifer G,

and the main piston G has completed its stroke. Then the operation isreversed, as before.

What I claim as my invention, and desire to secure by Letters Patent, iss l. The combination of an exterior steampiston, open to the cylinder atits opposite ends and containing an interior piston, and an exteriorwater-piston, also open at the ends and containing an interior piston,whereby the interior steam and water pistons are operated before themovement of the exterior steam and water pistons, to gradually start andstop the movement of the water, substantially as described. V

2. The combination of the exterior piston, (1, open at both ends, theinterior piston, E,

piston-rods D and F, the exterior water-piston, L, open at both ends,and the interior water-piston, M, substantially as described,

3. The combination of theexterior piston, 0, provided with ports J, theinterior piston, E, piston-rods D and F, the exterior waterpiston, L,provided with ports K, the interior water-piston, M, and the buifers Gand H, substantially as shown and described. JAMES BLESSING. Witnesses:

GEo. H; Evans, ANTHONY GREF, Jr.

